Connes distance of $2D$ harmonic oscillators in quantum phase space

TL;DR

This paper calculates the Connes distance between quantum states of 2D harmonic oscillators in phase space using spectral triples, revealing that the distances obey Pythagoras' theorem.

Contribution

It constructs a spectral triple for 4D quantum phase space and explicitly derives the Connes distance between Fock states, demonstrating a geometric property.

Findings

Connes distance between Fock states is explicitly derived.

Distances satisfy Pythagoras theorem in 2D quantum harmonic oscillators.

Spectral triple construction for 4D quantum phase space is achieved.

Abstract

We study the Connes distance of quantum states of $2D$ harmonic oscillators in phase space. Using the Hilbert-Schmidt operatorial formulation, we construct a boson Fock space and a quantum Hilbert space, and obtain the Dirac operator and a spectral triple corresponding to a $4D$ quantum phase space. Based on the ball condition, we obtain some constraint relations about the optimal elements. We construct the explicit expressions of the corresponding optimal elements and then derive the Connes distance between two arbitrary Fock states of $2D$ quantum harmonic oscillators. We prove that these two-dimensional distances satisfy the Pythagoras theorem.